TAMPA, United States (AFP) — Pluto is covered with surprising dunes made of methane ice, which have formed relatively recently despite the frigid dwarf planet’s very thin atmosphere, international researchers said Thursday. Pluto’s atmosphere has a surface pressure 100,000 times lower than Earth’s, which researchers suspected might be too little to allow tiny grains of solid methane to mobilize and become airborne. Yet mild winds blowing across Pluto’s surface at speeds of some 19-25 miles […]